Fruity
Free Filter is a general purpose filter plugin.
Parameters
Type - Selects the filter type to be used: low
pass, band pass, high pass, notch, low shelf, peaking EQ & high
shelf.
Freq - The cutoff/bandpass/bandcut frequency (depending on the filter type
setting).
Q - This value has a different (or no) meaning for the different filters.
"Q" comes from the analog filters and basically means the filter's "quality".
With high pass/low pass filters Q is better known as "resonance", while
with others it defines the ability of the filter to create sharp frequency
"rolloffs".
Gain - This settings has meaning only for "peaking" filters and sets the
filter gain. Applies to peaking EQ, low shelf and high
shelf filter types.